siemens



(No Model.) 2 Sheets-Sheet 1,

C. SIEMENS.

METALLURGICAL FURNACE. N0. 475,351. Patented May 24, 1892.

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UNITED STATES PATENT FFICE.

CARL SIEMENS, OF ST. PETERSBURG, RUSSIA.

METALLURGICAL FURNACE.

SPECIFICATION forming part of Letters Patent No. 475,351, dated May 24,1892.

Application filed December 17, 1890. Serial No. 375,013. (N0 model.)

To all whom it may concern:

Be it known that I, CARL SIEMENS, a subject of the Emperor of Russia,residing at St. Petersburg, Russia, have invented new and usefulImprovements in the Construction of Metallurgical Furnaces, of which thefollow ing is a specification.

My invention relates to that class of furnaces which are provided withan arched roof or dome, especially open -hearth and tank furnaces; andit consists in a novel arrangement of parts for supporting the roof ofthe furnace independently of the hearth or bed, whereby the relativeexpansion and contraction of the roof and bed will not injuriouslyafiect each other.

' My invention further relates to the means employed whereby v thefurnace-roof may be repaired or a new roof built over the old one Whilethe furnace is in operation, and whereby the upper zone of blocksforming the furnacebed which are injuriously acted upon during theoperations of the furnace may be replaced without disturbing the roof ofthe furnace.

My invention also relates to certain other details of construction,which will be hereinafter fully described, and specifically set forth inthe claims.

In the accompanying drawings, which illustrate my invention, similarletters of reference indicate like parts.

Figure 1 is a vertical section through the melting-chamber of thefurnace. Fig. 2 is a sectional plan View. Fig. 3 is an enlarged detailView showing the construction of one side of the furnace and thearrangement for building an additional roof thereon when required. Fig.4 is a transverse section through the inclosing furnace-casing,supporting columns for the roof, and vertical binding rails and ring.Fig. 5 is a face View of the port- 'opening, through'which the productsof combustion leave the furnace. Fig. 6 illustrates the method ofsecuring the vertical rails with tie-rods.

In the drawings the bed of the meltingchamber A is shown circular insection. It may, however, be elliptical or of any other desired shape.The object of making the chamber circular in section is to prevent anycontact between the flame and the Walls of the chamber or thematerial onthe furnacebed, and thereby obtain a better heating effect, due to theradiation flame or flames, as fully set forth and described in UnitedStates Letters Patent No. 341,285, granted May 4, 1886, to FrederickSiemens, of Dresden, Germany.

The crown of the melting-chamber A, I prefer to build and supportindependently of the bed of the melting-chamber. My objects in doingthis are threefold: first, to permit independent expansion andcontraction of either the crown or the furnace-bed; second, to permitthe construction of a new crown or roof while the furnace is inoperation, and, third, to permit the replacement of the furnace blocks Bwithout disturbing the crown or root.

The furnace, as shown, is provided with the working doors 0, D, E, andF.

G is a tap-hole, which is made lower than the other ports and throughwhich the molten metal is drawn from the lower zone of themelting-chamber.

H is a tap-hole through which the slags are drawn off.

I and J are the gas and air ports, in which are shown locatedhydrocarbon-burners K and L.

M and N are ports in the roof of the furnace, through which steam or airblasts may be directed upon the molten metal from the jets O.

P is the exit-port, through which the products of combustion areconveyed from the melting-chamber.

Referring to Fig. 3, Q represents a column arranged on any suitablefoundation and which supports the angle-plate R, which in turn supportsthe block 13 and skewback S, from which is sprung the roof A of themelting-chamber. (1 represents a passage located between the angle-plateR, block B, and skewback S, through which a circulation of air may bemaintained for the purpose of keeping the angle-plate R 0001.

Between the exterior of the bed of the furnace A and the columns Q,which are placed equidistant around the furnace, I arrange a casing T,which may be of boiler-iron and so arranged that the sections overlapand are movable on each other, as shown in Fig. 4. By this arrangementthe expansion and contraction of the furnacebed are permitted.

U represents vertical tie-rails arranged circumferentially around thefurnace and bearing upon the columns Q, The lower ends of these verticalrails are fixed in the earth, and they are tied around the furnace bymeans of the binding-ring V and the tie-rods W in the manner shown inFig. 6.

In Fig. 3 a second crown A is shown sprungabout two (2) tonsof fiuxedore are introduced intothe melting-chamber until the furnacebed isfilled. After the bed. is fully charged as greatv a heat as possible ismaintained in the furnace. For this purpose, in addition to the gaseousflames burning in the furnace, a steam. or air blast is turned on, from,the jets 0' through the openings M and N, which materially aids in theformation of slag. The heat is continued from two(2) to three (3) hours,after which the slag is drawn out through the opening H, andsubsequentlythe molten metal is tapped out through the taphole G intoladles or into the casting-pit, as desired, leavingin themelting-chamber a portion of coarse metal, which serves as aheatreservoir and materially aids in, the reduction of the materialsubsequentlycharged over it.

I am aware that a metallurgical furnace has heretofore been constructedwith two roofs and also with the roof carried. independently nace shownand described herein, the construction of which and the method ofoperating the same being embraced in applications -filed by me December5, 1890, Serial Nos.

373,710 and 373,711.

What I do claim as my invention is-- 1. In a metallurgical furnace, thecombination, with supporting-columns for the roof, of angle-ironscarried by said columns, skewback blocks on said angle-irons, and twoindependent roofs, both of which are supported pendent roofs, both ofwhich are carried by said blocks and columns, vertical tie-rods, and abinding-ring surrounding said tie-rods in the plane from-which thesecondor outer roof is sprung.

4. In a metallurgical furnace, thecombination, with the furnace-bed, ofthe supporting-columns. arranged around said bed, the

angle-irons carried. by said columns, furnaceblocks on said angledrons,and a removable zone of furnace-blocks between the-top of the walls ofthe furnace-bed and the furnaceblocks carried by the angle-irons.

In testimonywhereof I have signed my name to. this specification in thepresence of two subscribing witnesses.

CARL SIEMENS.

Witnesses:

JAMES E. DRESHVILLY, ALFRED KVORGEV.

